{10x+6x×[x+2]}×5=580
问题描述:
{10x+6x×[x+2]}×5=580
答
{10x+6x×[x+2]}×5=580
{10x+6x×[x+2]}=116
10x+6x^2+12x=116
6x^2+22x-116=0
3x^2+11x-58=0